I have 16 coins, and can easily get to 17 but not to 30. Accordingly, I can only buy one of these lovely, lovely items.
[b]Ice Breaker[/b]
[i]Pro[/i]: Everyone seems to like it. Ammo regeneration, long range, high impact, and things explode when you kill them--seems useful.
[i]Con[/i]: I'm a terrible sniper. I'm the noob wasting a whole clip in the Crucible to get one body shot--or at least I would be if I bothered with snipers in the Crucible. In PvE I'm more willing to experiment, but I've had Patience and Time for a couple of months now and I have exactly two kills with it. I also don't have any shortage of high-quality exotic weapons to bring with me for PvE play.
[b]Obsidian Mind[/b]
[i]Pro[/i]: Throwing a nova bomb into a group of badguys is one of the most satisfying experiences in the game for me. Most of the time in PvE--particularly in Roc strikes and the weekly heroic--I suspect it's going to be a substantial upgrade over Light Beyond Nemesis.
[i]Con[/i]: Not getting Ice Breaker, mostly. I also don't think have a shader that's going to look good with it.
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Basically, I'll use Obsidian Mind all the time and I suspect I'll rarely use Ice Breaker. I don't have any exotic armor that seriously competes with Obsidian Mind, but I have a number of exotic weapons that compete with Ice Breaker (including Gjallarhorn). But I also don't want to be the person that didn't buy Ice Breaker when it was available and ends up kicking himself for the next four months.
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I was one freaking coin short the last time IB was sold, it's been a long four months. OM that I'm wearing came from a Xur engram, so I'd take my chance on that rather than hoping IB gets sold again.
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Icebreaker
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One last bump before I give up (and just buy Obsidian Mind, because it doesn't require me to convince my friends to drag my L27 Hunter through the L30 Weekly.)
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Bump?
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Dude trust me. You will kick yourself in the face if you don't get ice breaker. With unlimited ammo and solar damage combined with high impact, you'd be unstoppable in most pve scenarios including solar nightfalls.